Aram Pan, the Singaporean photographer who runs DPRK 360, recently posted a long video at the Pyongyang International Trade Fair. He walks around the grounds and his two lovely guides explain the products to him and where they come from.
The details you can observe here really show a lot, and one that stands out is at 12:18 - you see a transaction taking place in US dollars...at the Cuba booth (actually you see a lot of greenbacks trading hands). The times they are a-changin'. For the better.